Granted Patent
Utility
US 5,472,216 · App. 08/316,652
Seal ring for valve stem
Inventors:
Kenneth R. Albertson, Vernon R. Bolinder
Patented Case
View Patent ↗
Granted: Dec 5, 1995
Filed: Sep 30, 1994
Inventors
Kenneth R. Albertson
Vernon R. Bolinder
Assignee (at issue)
Parker-Hannifin Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.